Presser foot for sewing machines



Sept. 8, 1959 M. T. VOIGT 2,902,958

PRESSER FOOT FOR SEWING MACHINES Filed Oct. 25, 1957 INVENTOR M P x T.\IOIGT l /MM ATTORNEY United This invention relates generally to presserfoot devices for sewing machines and more particularly to improvementsin auxiliary lateral guides therefor of the type shown and described inmy prior United States Letters Patent No. 2,487,285, granted November 8,1949.

The compensating presser foot of the present invention includes a pairof presser shoes that are operative to facilitate sewing a strip orpanel to an underlying main body of fabric along a line which is closelyadjacent a free edge of the strip or panel, and an auxiliary lateralguide or stripper that is operative to facilitate sewing a second andmore remote line of reinforcing or decorative stitching which isparallel to the first line of stitching. Known stripper arrangementshave not proven to be entirely satisfactory because after one edge ofthe strip or panel has been stitched, the presser foot is raised onlyslightly and the work shifted laterally under the presser foot toposition the opposite edge of the work thereunder, and normally thestripper remains spring pressed downwardly upon the fabric, bearingthereon with suflicient force to cause bunching of the fabric againstone side of the stripper as the work is shifted, in consequence of whichsome delicate materials are damaged. Accordingly, a principal object ofthe present invention is to provide means for controlling movement ofthe stripper so as to secure the same against bearing with undue forceupon work shifted laterally thereunder.

Another principal object of the present invention is to provide suchmeans for assuring that the stripper is elevated a distance at leastsufficient for clearing the panel being sewn when the presser foot israised, and which may be adjusted to facilitate sewing panels differingin thickness.

Other objects and advantages of the present invention will appear morefully hereinafter, it being understood that the invention consistssubstantially in the combination, construction, location and relativearrangement of parts, all as described in the accompanying drawings andas finally pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side elevation of an exemplary compensating presser footconstructed in accordance with and embodying the principles of thepresent invention.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is a vertical section on line 3-3 of Figure 4.

Figure 4 is a horizontal section on line 44 of Figure 3.

Figure 5 is a vertical section on line 5-5 of Figure 4.

Figure 6 is a vertical section on line 66 of Figure 5.

Figure 7 is a perspective view of the stripper only.

Referring to the drawings, the exemplary presser foot constructed inaccordance with and embodying the principles of the present inventionincludes a shank 10 that has formed upon its lower end a relativelybroad yoke 11, which has a pair of parallel horizontally extendingdownwardly facing channels 12 and 13 separated by a web 14, the channel12 being embraced by the web 14 and a side wall 15, and the channel 13being embraced by the web 14 and a side wall 16.

atent 2,902,958 Patented Sept. 8, 1959 ice side within the largerchannel 12 and conjointly carry an auxiliary presser shoe 21, the shoes18 and 19 being in turn carried by the portion of the pivot pin 17 thatspans the channel 12, and being spring pressed downwardly, as shown. Anysuitable arrangement of the compensator foot parts that are housedwithin the channel 12 may be utilized, but as illustrated, thearrangement is identical with that of the pertinent embodiment which isdisclosed in my pending application for United States Letters Patent,Serial No. 581,084, filed April 27, 1956, now Patent No. 2,887,969,granted May 26, 1959, to which patent reference may be had foradditional details.

Disposed within the smaller channel 13 is the lateral guide member orstripper 20 the channel-embraced portion of which is transversely bored,as at 22, to permit the projection of the supporting pivot pin 17therethrough. A channel-embraced portion of the stripper 20 is recessed,as at 23, for accommodation of a coiled compression spring 24 thatexerts a normal bias on the stripper 20 in advance of the pivot pin 17tending to maintain the forwardly extending portion of the guide elementdepressed, as best shown in Figure 3 by broken lines. In the depressedcondition of the stripper 20, the inner flat side of the stripper servesas an auxiliary guide for producing a second line of stitching spacedinwardly from the initially sewed edge of the top strip or panel, i.e.,in the operation of the presser foot of the present invention, thespring-presssed auxiliary guide member or stripper 20 serves as alateral guide against which an edge of the work to be stitched may beheld as it is fed through the sewing machine head. conventionally, toproduce the first line of stitching the work is fed through the presserfoot wtih an edge of the strip or panel bearing against the inner sideof one of the presser shoes. And to produce the second line of stitchingthe initially stitched work is again passed through the presser foot,this time with the sewed edge of the top strip bearing against theauxiliary guide member or stripper 20.

For controlling the stripper 20, a screw, designated 25, is threadeddownwardly through the base wall of the channel 13, and the inner end ofthis screw is brought to bear upon the top of the stripper 20 to therear of the pivot pin 17, as shown. The screw may be turned more or lessinto the channel 13 to thereby limit downward swinging movement of thefore end portion of the stripper 20 about the pivot pin 17 under theinfluence of the spring 24.

Preferably the screw 25 is threaded into the channel 13 a distancesufiicient so that when the presser foot is raised the customarydistance to release the work, preliminarily to shifting the samelaterally under the presser foot, the lowermost stripper portion iselevated at least to the upper surface level of the panel being sewed,in consequence of which if the panel is not already under the stripper20, it may be shifted laterally and inserted thereunder without the edgeof the panel fouling the inner side of the stripper, and if the panel isalready under the stripper 20, the work may be shifted laterallythereunder without such undue pressure from the stripper as to cause thefabric to bunch up against the side of the stripper, or as to causedamage to material that is light in weight or delicate in texture orfinish.

It will be understood, of course, that the present invention issusceptible of various changes and modifications which may be made fromtime to time without departing from the real spirit or generalprinciples thereof, and it is accordingly intended to claim the samebroadly, as well as specifically, as indicated by the appended claims.

What is claimed as new and useful is:

1. In a sewing machine presser foot having a supporting shankterminating in a depending yoke, a pivot pin carried by said shank andspanning said yoke, a presser shoe and an adjacent edge guide elementembraced by said yoke and mounted upon said pin for independent movementrelative to one another, spring means operative upon said guide elementto impart a normal bias thereto tending to turn the same upon said pivotpin in a direction for depressing the fore end portion thereof, andseparate means carried by said yoke and adjustable relatively theretofor selectively limiting the downward pivotal movement of the fore endof said guide element about said pivot pin, said edge guide beingmounted upon said pivot pin solely for rotational motion about said pin.2. A sewing machine presser foot as defined in claim 1 wherein springbias is applied to the edge guide member in advance of the pivot pin,and the movement limiting means is an element threaded through the basewall of the yoke and adapted for being turned more or less downwardlyinto the yoke for abutting the top of the edge guide member at a pointto the rear of said pin.

References Cited in the file of this patent UNITED STATES PATENTS1,198,780 Seymour Sept. 19, 1916 1,943,203 Chudner Jan. 9, 19342,487,285 Voigt Nov. 8, 1949

